Mini DV transfer to 24"iMac (M1 2021) macOS Monterey 12.5.1

I want to transfer a box full of Mini DD tapes to my computer to edit and store safely. I have a Sony DCR-HC52 mini DV camera. I have connected it to the camera with a camera cable and two adaptors - a 400 to 800 adaptor cable from the camera, a Thunderbolt 3 to Thunderbolt 2 adaptor, then another adaptor USB3 into the computer.

The tapes are playing on the camera screen, but the camera is not registering in iMovie and Quicktime does not appear to have any import facility.

I have been frustrated by having to get the different adaptors as each time I got one I thought that was all I needed!

I bought Vidbox video conversion device to transfer from a Sony Video8 camera and they just dropped onto my desktop via the software package.

I am not very bright and am confused by these apparent difficulties. Can anyone explain to me in simple terms what I have to do to capture these (to me) priceless tapes on my iMac please?

David